In shot: Don't use autoconversion. Use templated materials.
Templated materials automatically pick up the relevant textures from the DAZ materials. You make them from normal materials, simply by checking the "TEMPLATING" box in an image node in the NGE:

Then just select which source to use and add the material to you presets.
When you want to use it, load up a figure and select the surfaces you want to give a specific material. Here I've selected all the skin areas on GF 3:

Then just drag on drop on your templated materials:

This assigns the material to these surfacs, picking up the relevant textures. Rendering gives you this:

Sometimes something goes wrong and your material is still white. Just unlink the material and try again

Now select your nrw materials and rename them after the surfaces:

And you get something like this:

Note that I have fewer materials in the last shot. I had to redo the face and ear mats, so they ended up as seperate materials. Just drag and drop one onto the other, and do the rename again to get the above.
If you want to simulate the old autoconversion, just template a simple diffuse mat and drop everything on that
